[libhid-discuss] retrieving large HID descriptor bytes

[mike stone]

Peter Stuge <peter <at> stuge.se> writes:

Hi Peter,

> 
> > usb_interrupt_read worked. usb_control_msg failed.
> 
> How does the control transfer fail?
> 


    tmp[0] = 'S'; tmp[1] = 'c'; tmp[2] = 0x0; tmp[3] = 0x0; tmp[4] = '\n';

    ret = usb_control_msg(dev_handle, 0x22, 0x9, 0x200, 0x0, &tmp[0], 24, 1000);
    if( ret < 0)
             printf("usb_control_msg failed*** %i \n", ret);



    usb_control_msg failed*** -2 

Thanks!

Mike